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COPYRIGHT STATUS

The original books are in the public domain in the United States.
However, since Einstein died in 1955, they may still be under copyright
in many other countries, for example, those that use the life of the
author + 60 years or life + 70 years for the duration of copyright.
Readers outside the United States should check their own countries’
copyright laws to be certain they can legally download these ebooks.
The Online Books Page
has an FAQ
which gives a summary of copyright durations for many other countries, as
well as links to more official sources.